Water injection valve combination with cement spraying nozzle



Feb. 12, 1952 R. N. GILLESPIE ETAL Y WATER INJECTION VALVECOMBINATION WITH CEMENT SPRAYING NozzLE Filed Nov. 24, 194e DRY MA TEP/H L v INVENToRs:` Jig-Gill ,e

and,

:Ls o her ATTORNEYS'. Y

Patented Feb. 12, 1952 WATER INJECTION VALVE COMBINATION WITH CEMENTV SPRAYING NozzLE Robert N. Gillespie, Jesse K. Mair, and Christopher J. McNally, Allentown,-1Pa., as signors to. l Cement Gun Company, Inc., Allentown, Pa..a. corporation of New Jersey., Y l

Application November 24, 1948, Serial No. 61,873`

Z Claims.

l The present invention relates to cement spraying-apparatus and, more particularly, to an improved water injection valve combination for hydrating cementitious material prior to spraying.

Generally, in cement spraying apparatus a mixture of cement and sand is blown by air through a nozzle against a surface which is to be coated. This mixture of cement and sand must be hydrated prior to application and, accordingly, it is necessary that small amounts of water be added tothe mixture before passing from the nozzle. This is usually accomplished by surrounding the nozzle body with a water jacket and inserting within the body a brass ring provided with small perforations. In this manner, the mixture as it is blown through the nozzle body is hydrated by water ejected from the perforations. Since the ring perforations must necessarily be very small, the spraying operation frequently is stopped in order to remove silt or organic matter deposited in the holes by the water. Furthermore, poor hydration of the mixture is likely to occur Vsince the pressure of water leaving the'holes is practically zero. This drop in pressure arises from kthe difficulty of making the perforations small enough to supply at high pressure the very small amount of water which is actually required for the hydration.

Accordingly, it is an object of the present invention to provide a Water injection valve combination which is substantially free of the undesirable operating characteristics described above.

Furthermore, since the mixture of sand and cement creates an abrasive action on the interior surface of the nozzle body, it is another object of this invention to provide inexpensive and easily replaceable means which prevent the wearing of the nozzle body itself.

These and other objects will appear more clearly from a study of the accompanying drawings in which:

Figure 1 represents a side elevation of the water injection valve combination,

Figure 2 represents a vertical sectional view of the invention with the valve stem shown in elevation, and taken on line 2-2 of Figure l,

Figure 3 represents a fragmental sectional view of the nozzle body,

Figure 4 represents a side elevation, with a part in section of the wear ring utilized in the present invention, and

Figure 5 represents a side elevation of the invention connected to a spraying nozzle ready for use and on a reduced scale.

More specifically, the water injection valve combination is comprised'ofa valvegbody I having an 'internally'threaded inletf2 and an outlet .nipple 3.*Threaded into the inlet 2 is a' short .lengthAA of pipe 4' which .is supplied with water under high pressure from a suitable source through a flexible conduit '5 and: coupling member 6. The nipple-3 is providedwith an externally threaded portion. 1 and a smaller tubular end portion 8 having ayalve seat 9 formed "on: its .edge su'rface.,-y Communicating with the'inletf2 and extendingthroughthe valvebody I andinipple y.3 is a fluid passage Iiiv in which a valve sternvv I is movably mounted. lAt 'the'lower-fend of the l`stem yII is a .conical-.valve head I Zf'y'vl'iicli` cooperates.- with` the seatI 9 of'L the nipple 3. A portion of the stem Ill is equipped with screw" threads 'I3 which are. received `by the threads I4 of the bushingmember I5, -Theflatter member is threadably-sec-ured to the valve-body 'I'Y as 'shown at I6. In'order :to prevent leakage about the: valve" stem- II suitable packing Il is placed about the stem and compressed by-the threaded' cap I8 and packing gland I9 fitting on theupper end of the bushing memberv lI 5. A suitvable"'hand-wheel 201for operating the valve-is iix'edA to theftop'portion ofz'the4 stem-:I I-P-in the us'ualn'la'nner.V ff

The nipple 3 of the valve body is firmly fitted into an upstanding female portion 2| of the nozzle body 22. As is apparent from Fig. 2, the opening in the nozzle body into which the nipple 3 is fitted is constructed to exactly conform to the shape of the nipple.

In addition to the female portion 2 I, the nozzle body 22 is provided with a threaded inlet 23 to which a flexible material supply conduit 24 is connected, a threaded outlet 25 to which the nozzle tip 26 is joined, and a passage 21 located between the inlet and outlet openings. In order to prevent Wear on the interior surface of the nozzle body passage, a metallic, replaceable wear-ring 28 is snugly fitted therein. This ring member is provided with an opening 29 through its upper surface in order to admit fluid from the fluid passage I to the cementitious material passing through the nozzle body. In addition, a lock key 30 is formed on its lower outer surface which fits into a slot 3l in the nozzle body thereby preventing the wear ring from being forced out of position by the incoming material. As shown in Fig. 5, the preferred nozzle tip 26 is of a bulbous shape although smaller tapered tips may also be employed. In any event, the tip utilized is provided with a rubber liner 32 as shown by the dotted lines in Fig. 5.

From the above description, the operation of the water injection valve combination is quite apparent. The mixture of sand and cement is blown by air pressure through the supply conduit 24, the nozzle body 22, and the nozzle tip 26 out to the surface which is to be coated. In order to hydrate the mixture prior to its application, the valve-head i2 is moved 01T the seat 5 a distance which will give the desired degree of hydration and in this manner, water from a suitable source passes through the conduit 5, y

present valve arrangement may be cleaned simply by turning the valve wide open tor a short length of time. In addition, by the present invention, the water is injected into the mixture at a high pressure and, since vthe valve seat is .cone shaped, practically atomized, thereby improving the hydration oi the mixture and, thus, .eliminating rebound waste Aand increasing economy of operation.

Furthermore, the insertion in the nozzle body o! an inexpensive, easily vreplaceable Wear-ring r covering the area of the nozzle body which is subjected to the abrasive action of the cement and `sand mixture prevents the wearing :away of parts which maybe dimcult and costly vto replace. 1m

Having lthus described lour invention with the understanding that variations in the :torni vand shape of the present .development are within y the scope of this invention, what we claim as new is:

1. A water injection valve :combination for .cement spraying apparatus comprising a 'nozzle body haring a passage extending longitudinally therethrough, a :bore in said nozzle body vtransverse to said nozzle body passage and in direct communication therewith. avalve body mounted in said bore, said valve body having a :fluid inlet and a uid passageway communicating therewith, said iluid passageway extending longitudinally of said valve body and communicating directly with said nozzle body passage to provide a single relatively large fluid opening for admission of water from said fluid inlet into said nozzle body passage without substantial reduction of the iiuid pressure, an outwardly ilared valve seat within said bore about said fluid opening in direct communication with said nozzle body passage, and a -valve stem within said iiuid passageway and movable longitudinally thereof, said valve stem having an outwardly flared end for seating engagement with said valve seat which extends into said nozzle body passage in open position so that fluid passing through said iluid opening into said Inozzle body passage is deflected by the outwardly ared end vand thereby sprayed into said nozzle 'body passage.

2. The Water injection valve combination of claim 1 having a replaceable wear ring fitted snugly within said nozzle body passage, said wear ring having a transverse opening therethrough joining said iiuid' passageway with said nozzle body passage, and interengageable locking means on both said wear ring and said nozzle body vto maintain the proper positioning of the ring within said passage.

ROBERT N. GILLESPIE. JESSE'K. MAIR. CHRISTOPHER J. McNALLY.

REFERENCES CITED The following references are of record in ythe ille of this patent.:

UNITED ySTATES PATENTS Number Name Date Re. V16,539 Hamm Feb. 1, 1927 565,211 Knight.. Aug. 4. 1896 1,124,579 Ambursen Jan. '12 1915 1,153,132 Pettitt Sept. '1, 1915 1,562,194 Schaefer Nov. v12,1925 2,124,989 Smith July 26, 193B 2,392,408 Radonich Jan. 8, 1946 

